U.S. congressmen have approved a bill to deploy self-driving cars and prevent states from blocking them. The U.S. House of Representatives Wednesday passed the bill that would allow automakers to obtain exemptions to deploy up to 25,000 vehicles without meeting auto safety standards in the first year. That number would increase to 100,000 vehicles annually over the next three years. Automakers and technology companies hope to begin deploying vehicles around 2020. VOA's Zlatica Hoke reports.